These spider gears are a hardened-steel aftermarket option for TRAXXAS E-REVO 1/10 4WD differentials. Identified as ER1200S/G2, the kit replaces softer original spiders to reduce wear when the drivetrain sees heavy torque or extended running.
Installation is standard differential maintenance: strip the diff cover, remove the gear assembly, replace the spiders, check mesh and rotation, then reassemble with the diff oil suited to your tuning. No special equipment is supplied.
Consider this an endurance upgrade rather than a handling mod: steel spiders maintain stable gear engagement under load, which helps when pushing power or running steeper gearing, and reduces frequency of gear replacement.
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